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Heat oven to 220C/200C fan/gas 7. Heat the oil in a large frying pan and stir-fry the mushrooms over a high heat for 5 mins. Season with a good grind of black pepper and remove from the heat. Stir in the garlic, tomato pieces, breadcrumbs, walnuts, chopped parsley, chilli flakes and pesto until thoroughly combined.
Cut the peppers in half from top to bottom. Carefully remove the seeds and membrane. Place in a small foillined roasting tin and fill with the mushroom stuffing. Cover the surface of the stuffing with a small piece of foil. Bake for 35-40 mins until tender.